Pump



May 1942,

ADAM ETAL PUMP Filed Dec. 21, 1939 4 Sheaths 2 ag WLQQQ} j 'ucntowHanna.) anmns,

May 19, 1942. H. E. ADAMS In-AL 3 3 mm Filed Dec. 21 1939 tweets-sheep:a

flapoznwmma, Q #1240904 z May 19, 1942. H. E. ADAMS HAL Prim" Filed Dec.21, 1939 4 Sheefi-Sheet 4 Mano/.0 awn/flue, (1440.90 mmqras,

' expansion.

Patented May 19, 1942 UNITED STATES PATENT I o azaasis PUMP SouthNorwaik, Conn, and Rates, Corning, N. Y.; said Man! Harold B. Adams,WiilardA. amino: ta Nash or'nlk, cm, and laid Katee Work, Oorning,N.York I rica Company, South a corporation of Connecticut.

assignor tov Glass a corporation of New Application December 21, 1939,Serial se is ,..(o1. zsrss) 13Claims.

This invention relates to pumps. and more particularly to a pumpassemblage. of casing, impeller, driving means, and frame for thecasing, wherein the casing and impeller parts are formed of corrosionresisting material and, therefore, particularly applicable to thehandling of acids,

. and the like.

An object of the invention is to provide a pump construction, whereinsubstantially all of the parts that will contact in any manner with thefluid being pumped are formed of corrosion resisting material.

Another object of the invention concerns a centrifugal liquid pump inwhich the pump elements that come in contact with the fluids beingpumped are formed of vitreous material, such as glass, or likerefractory material. In this connection it has been found that glass isthe most desirable because of its high resistance to corrosion from mostacids, and because of its adaptability in handling liquidscontainingacids under the most eflicient sanitary conditions.-

Another object of the invention particularly concerns all glass pumpsand means whereby they may be satisfactorily sealed against escape offluid without, in so doing, developing suflicient localized heat todestroy the parts by differential ture is a hazard, and-accordingly itis a further herein, it is desirable to provi de for quick repair andreplacement of wom parts, and to this end there is disclosed a novelarrangement of stumng box elements and retaining members which promotesease and dispatch in the assembly and disassembly.

A further feature of the invention is the provision of means within thepump chamber by which the pressure of fluid on the stufling within thestuffing box is materially reduced so'thatan effective seal may bemaintained with -a limited degree of pressure and a correspondingrelatively slight generation ofheat within the sealing means.

Considering that the'impeller of the pump, as

well as the casing, is formed of materials of relativel'y low tensilestrength, and therefore frangible in nature, it is still'another and animportant impeller.

object to construct a pump in which is provided a strong metal frame, orhousing, which not only functions in the operation of the pump, but itis devised to support the pump casing under controlled pressure, in amannerto minimize crushfrom flying fragments, in the event that abreakage should occur.

One feature of the invention is concerned with the mounting of the pumpcasing within such a frame or housing in a manner which is protective tothe casing while, at the same time, holding the casing firmly andsecurelyduring normal op- ,ing or breakage, and also to affordprotection- This latter object contemplates the formation of a jointbetween one member which acts as a moving driving member, and anothermember which is driven by said moving member, of more or less generalapplication, but particularly adapted to uses in connection with a pumpof the type herein described.

. The invention has particular application, but is by no means limitedthereby-,in Joining a rotary glass impeller of a pump, to a metal drivinmember or shaft of the type illustrated and claimed in aco-pending U. 8.application of Harold E. Adams, Serial No. 275,755, filed May 25,

' A particular problem arises in the joining of a frangible -rotarymember, such as an impeller,

constructed of glass, to a metal driving member.

The strength of the materials in tension, in a rotatable member formedof such materials, as herein contemplated, makesit imperative that thejoint between the metal driver and the frangible driven member besomewhat resilient, yet free of play. By the construction of the presentinvention ajoint' is provided which overcomes these difficulties in avery efllcient and economical manner, and the invention contemplates theuse of a bonding material between the driving and driven members,which'is resilient in nature and has a lower modulus of elasticity thanthe members which are joined together. I

' One of the objects of the invention, particuiarlywith reference to thejoint between the drive shaft and the glass impeller, takes intoconradially overhanging or radially overlapping surfaces on the driveand driven members.-

A further feature of the invention is the sion of a Joint structureemploying a bonding medium between two preformed parts in which anypossible shrinkage of the bonding'material will result in a furtherstrengthening of'the mechanical interengagement of said parts.

Although the construction and operation of preferred forms of theinvention are illustrated and described, it will be understood that theyare intendedonly as illustrative and not as limiting, it beingunderstood that the invention is not to be limited, other than asdefined by the claims hereinafter appended.

To the attainment of the foregoing, and other objects which will appearas the description proceeds, reference is made to the accompanyingdrawings, in which: a

Fig. 1 is a sectional elevation of a centrifugal pump showingoneapplication of the present invention therewith;

Fig. 2 is an exploded perspective view partly broken away, illustratinga joint constructed in accordance with the present invention, between ametal drive member and an impeller removed from the drive shaft andwithout the bonding material;

Fig. 3 is anenlarged fragmentary sectional ele- Fig. 4'is a sectiontaken substantially on the V plane of line 4-4 of Fig. 3 which sectionis taken through the radial grooves;

Fig. 4a is a fragmentary enlargement of a part of Fig. 4; a

Fig. '5 is a section. taken substantially on the, plane of lines H ofFig. 3 when mounted on the drive shaft, said section being taken on aplane spaced from the radial grooves;

6 is an elevation of a pump embodying a slightly modifled form of frameor housing;

Fig. "I is a central section taken on the line "1-1 of Fig. 6;

in Fig. 8; and

Fig. 10 is a detail partly in section showing the mode of securing theframe sections together in the form of invention illustrated in Figs. 8and 9.

Referring now more speciflcally to the drawings,whe rein like referencenumerals designate like parts, and with particular reference to Figs.

1 to 5, it will be seen that the pump assemblage comprises a supportingframe or housing A, preferably made of metal, having acid resistingqualities or acidresisting coatings, a sectional centrifugal pump casingindicated generally at B, which casing is formed of a head section I anda crown A centrifugal pump chamber l3 is formed by the casing sectionsit and II and in the chamher is, mounted the centrifugal impeller I forprovi- -vation through the drive and driven member, 'removed from thedrive shaft;

pumping liquid. The eye orf-inlet port of the pump casing is indicatedat H, and the outlet port (not shown) leads from the periphery of thecasing B. In the center of the volute section, an integral stufnng boxextension or neck It is formed and .this extension provides the stufllngbox or seal chamber for the packing or sealing elements I! through whichthe hub I8 of the imp'eller I extends. In practice, the packing andsealing elements I! provide a mechanical seal between the chamber andthe hub to seal the pump chamber from the exterior of the casing andprevent leakage of'the liquid being pumped,

and at the same time prevent air from entering the casing and impairingthe ,suction of the pump. While the preferred form of the pump of thepresent invention is made of glass substantially as shown in thedrawings, it is obvious that certain of the mechanical details thereinillustrated may be modified without eliminating. the features of thepresent invention. Similarly the impeller and easing may be made of highsilicon iron, or high chromium, or high nickel steel, all of which aresufllciently resistant to corrosion for application to pumping certaincorrosive liquids while retaining certain other features of theinvention. However, these metals like glass, are

very difficult to vmachine and are usually machined by grinding, whichcharacteristics are the same as glass used in the preferred embodimentin the'present disclosure.

In order to produce a'successiul glass or vitreous pump capable ofhandling corrosive liquids, it is essential that all parts of the pumpcoming in contact with such liquids be formed from glass or whateverresistant material is being employed. In a centrifugal pump of the typedisclosed this requires that the shank it of the impeller land thesleeve IQ of the casing B be formed from glass as integral parts oftheir respective bodies. Thus, the only non-vitreous material exposed tothe action of the fluid being handled is the inner portion of thepacking l1. While various glasses are particularly resistant to attackby acids and by alkalis, all glasses, even those commonly referred to asheat resistant," have only a rather 65. .of the impeller.

or volute portion II. In the form of pump casing selected forillustration, the sections II and II are made of refractoryvitreous'material such as glass, for accommodating the pumping of highlycorrosive fluids, and thecasing sections are secured together in asuitably clamped relation, as hereinafter described.

limited ability to withstand differential heating and-the resultantdifferential expansion stresses within the glass. This inherent weaknessof glass has consistently thwarted all attempts to produce asatisfactory seal for an all glass pump inasmuch as the friction of apacking sufliciently tight to establish a fluid tight seal has generatedsuilicient heat in the adjacent portions of the glass parts to destroythem.

In the present invention the above difliculties and weaknesses have beenovercome by increasing the area of the packing II in contact-with shankII ,and by providing on the back or adja- 'cent face of the impeller I aseries of pump vanes V similar to, but somewhat smaller than the mainpump vanes V' on the front or working face It has been found that ifvanes are provided on only one side of the impeller "disc, fluid atthepressure developed at the periphery of the impeller will flow downits other I'face. Thus, if no means is provided to diminish thispressure the packing about the pump shaft must withstand and seal themaximum pressure developed by themump. On the other hand it is desirablethat a certain amountof the fluid being pumped penetrates into thepacking to lubricate the samesince otherwise some foreign lubricant mustbe provided which may dilute or contaminate the material being pumped.In the present structure the size and contours of the secondary vanes Vare so chosen with respect to the working vanes V and the length of thepacking il as to prevent any excessive pressure on the packing whilepermitting such seepage as is absolutely.

required. While it is feasible to couple metal to metal having suitableelastic limitsby the-commonly screws. Even though it were feasible to dothis,

the torsional stresses and strains in set screw and keyway couplingswould be localizedto the spot 4 of the set screw,'or the line of thekeyway, which it is desirable to avoid. 2

Thus, a further problem which arises from the use of glass, pottery, andsimilar vitreous materials which are relatively weak in tension is thatof suitably connecting the frangible impeller I to a metal drive shaft0, driven by a prime mover, such as the electric motor M. It will beseen that the joint of the present invention must not only provide asupporting connection between the drive and driven members, but it mustalso be the instrumentality by which rotary motion is transmitted to thedriven member, whereby the driven member performs work.

In order to connect the driven member, such as the impeller'I, to'thedriving member, it is desirable to provide the impeller with somecharacter of opening or cavity in which the driving member may beseated, or through which the drivingmember may extend. Since it isundesirable to permit any part of the prime mover connections tov passthrough the impeller where they would come in contact with the fluidbeing pumped, .it is preferred to adopt the cavity principle, and in thepreferred form of the invention a longitudinally fluted socket is moldedin the impeller hub ll (Fig. 2). The flutes provide the crests 2i andthe intervening valleys or troughs 22. The crests 2i serve as key-likeprotuberances, and the valleys 22 serve in the nature of keyways so asto conform to the corresponding configurations on the driving member.The side walls It of the crests ii are preferably parallel to each otherand to the radius passing through the center of the crest, as shown inFlgsd, 4G, and 5 for purposes to be hereinafter explained. Across thecrests of each of the flutes are axially spaced circumferentialiyextending grooves 28, connected across the valleys 22 by shallow 3generally known as a quill. which is made preferably of acid resistingmetal.

. The quill performs the function of distributing the stressesandstrains between the hub and the shaft C over agreater area than ispossible with known impeller couplings, and it accordingly functions "asa torque distributing member, as well as a driving member.

The quill is an elongated'body and has an enlarged cylindrical head 25and a reduced extension, indicated generally at 26,- terminating in aflattened transverse tang 21. A radially disposed cavity 28 in the innerwall of the socket 20 receives the tang when it is brought intoregistration, and cooperates therewith to form a mechanical drivingconnection "between thequill and socket. There will be suflicientclearance between the tang and cavity to accommodate a layer ofcementing or bonding material. The

head and reduced part are separated by a radial shoulder that has asemi-circular radiallyextending groove 30 in its face. The groove 30forms a vent or riser for excess cementing or .bonding material when thequill is inserted in the socket 20, thus allowing the shoulder 28 to bebrought up against the free edge of the hub it and giving betterpositioning of the quill in assembling with the impeller, and alsoproviding an index that the cavity between the ,quill'and the hub socket20 has been completely fllled with bonding material during the assemblyoperation.

- There is a slight overall taper from the outer to the inner end oi thesocket 20 in the hub and the reducedpart 2 6 of the quill iscorrespondingly tapered.

The reduced part 26 is formed with flutes slightly smaller than theflutes in the socket so that the crests 3i and the valleys or troughs 32radial direction, and vice versa, with the bond grooves 24. The grooves28 form a series of. spaced rings substantially interrupted by thevalleys22 in the wall of the socket 28.

While the hub It may be secured directly to the drive shaft C, in themanner explained'in the present invention, it has been found to be morepractical to'interpose an. intermediate connection, and .toward thisend, there is used as the driving member 1), a hollow spindle or thimbleon the reduced part 26 will leave a clearance with the correspondingcrests 2i and valleys 22 in the socket!!! so as to permit a certainamount of the bonding material 33' to congeal between the confrontingsurfaces and resiliently lock the hub, and driving or torquedistributing member D together. The side walls ll of the crests 3i arelikewise parallel to each other and to the radius passing throughthecenter of the crest It will be seen that when the quill is assembledin the hub, the crests of the flutes on .the hub overlap or overhang theflutes on the quill in a- 33" in between, and this prevents rotary playbetween the parts. I

At the outer end, each of the valleys 32 terminates in an outwardlyflared pocket 33. The pocket 38 allows clearance. for the ends of thecrests 2i 0! the flutes in the socket should any flns be adhering tothem due to faulty casting, molding-or grinding. The riser groove 30registers with one of the pockets 33. Extending across the crests 3! area plurality ofclrcumferentially extending axially spaced grooves 85, andthese grooves cooperate with the grooves 23 in the crests 2i of theflutes in the hub socket 2|! when the quill is assembled in the hub.Like the grooves 23 in the socket 20 of the hub, the

grooves 34 form a series of spaced rings interrupted by-the interveningvalleys 32. These grooves Hand 34 prevent longitudinal movement betweenthe quill and impeller, while the radially overhanging flutes on thequill and. hub

prevent rotary movement, when the terial is applied. I

Along the axis of the quill is a-socket 35 which receives the stub driveshaft C of the prime bonding maquill, and a second set screw 42 threadedin an opening 43 in the head 25. The positioning set screw 39! engageswith an opening (Fig. 1) in the stub drive shaft C, and when seated inthis opening the impeller will,be locked in its proper position on theshaft. The inner end of the set screw 42 abuts the periphery of thedrive shaft C and takes up all play in the parts where-' by any tendencyof the impeller to wobble is eliminated.

The quill is anchored to th impeller I by a bonding material 33a.Preferably there is used an alloy, cement, or bonding material havingthe characteristic of becoming liquid or thermoplastic under heat at atemperature that will not injure the glass when the bonding mate-' rialis applied, although hydraulic cements may also be used. Among thedesirable bonding maerally designated as type metals which have thedesirable property of expanding slightly while cooling from a liquid toa solid phase. This property is valuable in the present inventionbecause the irregularity in the surfaces have been specially designed toaccommodate such an expanding material.

The preferred way of joining the metal quill to the hub I8 is to heatthe-quill and impeller to a temperature approximately that of themelting point of the particular composition used. A quantity of thecomposition slightly in excess of that required is placed in the socket20 and the hot quill is inserted until shoulder 29 comes up hard againstthe end of the huh I. The excess material will meanwhile escape throughthe vent, or riser 30. When the quill is in its inserted position, thecrests 2| of the flutes on the socket willsubstantially register withthe corresponding recesses or valleys 32 in the flutes of the quill. Ina like manner, the valleys 22 in the socket'20 receive the crests SI ofthe .flutes on the reduced part 26. In this position, the extremity ofthe crests on the flutes on the quill or driving member D, radiallyoverhang, or overlap the extremity of the crests of the flutes in thesocket 20 of the impeller or driven member I.

As heretofore pointed out, there will be continuous spaces between thecorresponding crests and valleys in the socket 20' of the impeller andreduced part 28 of the metal quill in the assembled relation, and theshoulder 29 will be bearing against the free edge of the hub I8. Thealloy bonding composition will then flll the space between thecorresponding crests'and valleys of socket 20 and reduced part 26; andalso fill the grooves 34 in the crests 3| of the flutes of the quill,and the grooves 23 in the crests 2| of the flutes in the socket.

While the tendency of the preferred alloys is to expand slightly oncongealing. all such alloys and cements will shrink upon further coolingand, if the rate of shrinkage be different from the adjacent glass andmetal parts, there will be a slight loosening of the joint. Suchloosening is overcome inthe preferred form of the invention by thespecial design of the side walls of the crests 2| and 3|, as previouslydescribed. The shrinkage of the bond 33" which loosens the joint isprimarily in a generally ra-.

dial direction. Due to the above described configuration of the crests,it will be seen (Fig. 4a) that any contraction of the bond 33a radiallywith respect to the quill 26 and hub l8 will result in an increasedclamping action of the solidified bond against the walls 2| and 3| of Ithe various crests. In this manner a tight joint terials are those lowmelting point alloys genis ensured regardless of the rate of contractionof the bond.

It is pointed out there is an axial and cirlcumferential bond 33a ofbonding material throughout the entire confronting area between thesocket in the hub and the reduced part of the quill.

It will be understood that the bond is not an adhesive bond between themetal of the quill 26 and the glass of the hub l8. The composition willbe adhesive or "wet only to the metal of the quill, and not to theglass. Because of-the different rate of expansion and contractionbetween metal and glass, it is not practical to have a bond which isadhesive to both materials. However, the composition when "set" forms aslightly yieldable cushion sufliciently conformed to produce a goodmechanical bond, but yieldable sufllciently to distribute torque. Inother words, the composition forms a load distributing couplingeffective to maintain shear stress in theglass well below'its rupturevalue.

As a matter of fact, it is not essential to attain ing material which isnot adhesive to the quill is used, then it is desirable to use amaterialhaving a coeflicient of expansion greater numerically than thecoefficient of expansion of the material of the quill, so that thebonding material will shrink tight about the quill on cooling.

As afurther variation, if a material is used which provides goodadhesion to the quill, then it is not even necessary to form grooves inthe quill.

,Inaddition to this bond, there is the mechanical lock against rotationbetween the parts, caused by the radial overhang between the flutes.This mechanical lock is augmented by the expantion of the tang 21 intothe socket or keyway 28. From the foregoing it will be obvious that thedriving stresses, when the parts are rotating are well distributedthroughout the quill.

Thenthere is the still further mechanical lock against axial, orlongitudinal movement between the parts occasioned by thecircumferentialgrooves 23 and 24. These three factors distribute ofexample of suitable alloys for use as bonding materials:

Another and important problem involved in the construction of pumps,utilizingglass or other ceramic or vitreous materials is found in eventthat breakage should occur.

- To this end there is provided a sectional metal a housing or framewhich furnishes a protective 1o being suitably assembled thereon, andthen. the pump casing may be completedby placement of 'aaeaus I 5 theassemblage, mounting and adequate support for the pump casing withinwhich is formed the pumping chamber. It is, of course, essential thatthe pump casing be held firmly and securely,

while at the same time avoiding any tendency to produce localized straintherein, and also to afford-protection from flying fragments, in theguard, as well as adequate support, this sectional housing beingsuitably clamped under predetermined uniform pressure.

In Fig. 1, the sectional metal housing or frame A provides a support forclamping the sections of the pump casing B together, and also providesthe protective guard for the casing. All of the outer metal parts of thepresent structure, including the housing A-may be made of cast iron, orother metal, not necessarily highly resistant to acid or acid vapors,and such metal parts may be plated with acid resisting material, such ascadmium, or covered with rubber base paints, or other suitable acidresistant coating. This housing A is preferably formed in two 1 majorportions or sections, the inner of which consists of a frame section 50which may be suitably braced or bolted if desired, to the motor M. Oneconvenient and conventional mode of supporting the frame 50 would be bya spideror 3 struts between the housing A and the motor, as illustratedfor example in Fig. 9, but any. con-' venient method may be used. Theouter section of the housing A comprises an annular flanged member 5|having aflange 52 directed radially inward to embrace a face of thecasing section Ill, a projecting flange 53 disposed substantially atright angles to the flange 52 to encompass the periphery of the glasssection I, and an out- 'wardly directed flange portion 54 which pro- 40vides means for securing the section ii to the section 50. The sectionor portion isgenerally bell shaped to accommodate and encompass theglass casing section if -and terminates in its outer peripheral edgewith a thickened flangelike section 55, rabbeted, as indicated at 56, toreceive the flange. 53 of section 5!, and thereby provide a matingrelation between the two housing or main sections 50 and 5|. The flange54 is suitably drilled to receive threaded bolts 51 which may bethreaded into the flange 55 of section 50.

It will be evident then that the pump casing.

' section II may be mounted within the bellshaped housing or framesection 50, the impeller the section casing Ill and securing thereof inplace by the housing or frame section 5|.

In order to avoid a metal to glass contact and insure distributedloading, corner strips 58-58 of resilient material are insertedcircumferentially about the corners of the respective sections In and Hof the pump casing, and the frame but in order to facilitate suchassemblage and to provide for adjustments of pressure against the gland,and to facilitatetake-up occasioned by'wear, temperature, or otherconditlon 50, is formed open, and adjustable means are provided foreffecting a closure thereof. To

this end an annular ring-like plate 59 is provided with a centralopening 60 of a size large enough to surround the hub of the impellerand the drive shaft therefor with ample clearance. pose of this plate 59is not only toclose the openingof the section 50 but also to apply ayieldable pressure against the elements of the gland, and

it will be observed that the sealing elements I! are backed up with .afollower 6i, preferably of glass, or of material having the sameexpansion and contraction characteristics as the material from which thepump casing and-impeller are made. the gland and backed up by packing ofresilient material, indicated at '62, which in turn is backed up by theplate 59. Studs 63 threaded into the section 50 extend freely throughperforations circumferentially disposed in the plate 59,.and carry attheir outer ends take-up nuts. Interposed between the nuts 64 and theouter face of the plate 59 are springs 85. In the preferred embodimentof the invention, studs 63 are threaded for only a short distance ateither end and. the length and strength of the springs 65 are so chosenthat they will never befully compressed when nuts 84 are drawn up totheir extreme limit of travel. Thus the pressure exerted on the follower6i and packing II by ring plate 59 can never exceed a predeterminedmaximum pressure established by the characteristics of springs 65.

It might be noted that the elements mm ad-,

dition to functioning as a seal in a stufling box or gland, may beformed of material eifectiveto dispose of frictional heat and transfersame from the point of heat development. A suitable packing for thispurpose may be prepared from asbestos fibres, lead shavings, andgraphite,

From the foregoing it is evident that a controlled and predeterminedpressure is exerted on the stuffing gland and transmitted through thestuffing box assembly, through the compression' afforded by the springs65. I

Referring now to Figs. 6 and ,7, it will be observed that the essentialelements-therein are substantially the same as illustrated in Figs..1

to 5. However, the supporting housing or frame A for the casing B,instead of being bolted or otherwise secured to the motor M, is providedwith a standard 66 having a substantial base 61 and arranged to encirclethe neck or hub-like portion 68 of the, housing A. Provision is made inthe form of a threaded opening 69 for a set screw effective'to securethe standard tothe housing. Incidentally in Fig. 6 the discharge oroutlet from the pump casing is illustrated at 10, and this same type ofoutlet or discharge may be used in several forms of the invention. Thestandard 88 may be formed with legs ll and the upper portion of thestandard made separable from the base and leg portions to facilitateassemblage. In this event bolts 12 entering the socket portions I3 maybe utilized to secure the standard in position.- This, however, isoptional as obviously-the standardmay be made an intesral structure.

It has been stated heretofore that variations are possible in the jointand bonding media between'the drive shaft and hub of the pump impeller.Fig. 7 illustrates one such variation in which the hub. l8 of theimpeller I is provided with circumferential inner grooves 21. of sub-.stantially uniform depth throughout, such depth The purtions, the rearof the housing A, i. e., the sec- 'being equivalent to that of thelongitudinallyex tending grooves or flutes 32'. In this arrangement itis. contemplated that connection may be made directly to a drive shaft(not shown), or to a quill, but the tang 2'! (Fig. 21) may be omitted inthe form shown in Fig. 7.

Figs. 8, 9 and 10 illustrate a somewhat further modification orembodiment of the invention, in

which the volute l5 and the closure plate 16 are arranged somewhat thereverse of the showings in Figs. 1 and 7, and in which the mode ofclamping the frame sections and casing members I5 and I8 is difierent.In this embodiment, we find the volute. 15'on the forward or outerportion of the pump casing, extending outwardly into an eye or inlet 11,and forming a pump chamber, when assembled for the impeller I. Adischarge I8 extends radially outward instead of tangentially, but thisarrangement of inlet and out-' let can be varied to suit a particularinstallaradially extending flange-I9, and the section 76 has a similarflange 80 which merges into a shoulder 8|. When assembled the flanges l9and 80 will be abutted, and the shoulder ill will fit within theperiphery of the bell of the volute 15. While no gasket is illustratedbetween the flanges 19 and 80 (Fig. 10), it will be evident that anysuitable packing or gasket may be utilized, asdesired, and thebase ofthe flange 80 is channeled, as indicated at 82, for the reception ofpacking at that point.

The frame or housing for supporting the pumpcasing takes the form of anannular member 83 secured to struts 84 which extend rearwardly to themotor M and form a support for the pump assemblage. Metal clamping pads85 which may take the form of a complete annular ring, but

as illustrated are spaced pads, are arranged for placement exteriorly ofthe flange 19 and volute I5, as outer supporting or retaining meansforthe assembled sections and 16.

In order to secure the parts in assembled relat-ion, ears 86 are formedon the annular section "of the frame, these ears, together with pintlespressure applying medium to the stufling box. As shown in Fig. 9, theplate 5; is entirely supported by bolts 83', circumferentially disposedin suitable openings adjacent the periphery of the plate 59*, being inturn mounted in lugs 94 which are formed on the respective struts 84,instead of being secured into the frame or housing proper. Pressureadjusting nuts 64" control the pressure applied to springs 65 in amanner similar to that illustrated in earlier figures of the drawings.The other features of the pump structure and of the Joint are in allrespects similar to those heretofore described in connection with otherfigures.

Having thus full described the invention, what we claim as new anddesire to secure by Letters Patent of the United States is:

1. In a centrifugal pump of the type adapted to handle corrosive fluids,and wherein elements of said pump are subjected to a wide range ofcreated temperatures, the combination of a rotat able glass impeller, adrive shaft for the glass impeller, a quill interposed between theimpeller and the drive shaft, effective to distribute torque over alarge area to the impeller, with mechanical means for connecting thequill to the drive shaft, and a firm connection including a mechanicalinterlock and a bond of plastic material distributed therein, betweenthe impeller and the quill, effective to accommodate differentialexpansion between the impeller and its driving means.

2. In a centrifugal pump of the type adapted to handle corrosive fluids,and wherein elements of said pump are subjected to a wide range ofcreated temperatures, the combination of a glass impeller provided witha glass-hub, a drive shaft for the impeller, with torque distributing.means bonded to the hub and mechanically connected with the 'drive shaftfor driving the impeller, the bond between the torque distributing meansand the hub including a mechanical interlock and a bond of plasticmaterial distributed therein, said plastic material having thecharacteristic of accommodating differential expansion between thetorque distributing means and the hub.

3. The combination with a rotatable, vitreous pumping member, of anon-vitreous drive shaft,

- torque distributing means interposed between said shaft and saidmember, and solidified plastic material interposed between said torquedistributing means and said member providing a firm,

87, forming hinges for clamps 88. The clamps" 8| are provided withpressure adjusting screws 89 threaded into lugs 90 and eifective, afterassemblage of the parts as an adjusting means for holding the pumpcasing sections in proper relation under desired pressure. Gaskets SIand 92 function in a manner similar to thegaskets 68-58 of Fig. 1 toresiliently protect the glass provide a means for mounting the faceplate or resilient bond between said distributing means and said member,said torque distributing means and said vitreous pumping member havingcooperating, inter-related portions bonded to each other in a mechanicalinterlock by said solidified plastic material.

4. A joint comprising a rotatable, metallic drive member, a rotatable,frangible driven member providing a socket for said drive member, saidve member having a portion disposed in said s ket, said parts being soshaped and proportio ed as to provide cooperating, inter-related partsormingclearance's between the exterior of said ive member and theinterior of said driven member when in assembled relation, anda plasticbond solidified within the clearance between the interior walls of thedriven member and that portion of the drive member whichprojectsthereinto, providing, when set, a firm, resilient bonded,mechanical connection between the drive and drivenmembers.

Y I; members, and effective to provide a cushion coupling therebetween.

10. A rotary joint comprising a rotatable drive member, a frangibledriven member, a

laterally projecting frangible hub on one .side of the driven memberprovided with a socket extending axially'of said driven member, aportion of the drive member being disposed in said socket in spacedrelation to the walls thereof, a cushioning bond of thermo-plasticmaterial in the space between said portion and said socket .walls formedof a material that has the property relation, and a firm bond ofcushioning material within the clearances between the interior walls ofthe driven member and that portion of .the drive member which extendsthereinto.

6. A joint comprising a rotatable, metallic drive member, a rotatable,frangible driven member having a hollow portion for reception of saiddrive member, said drive member being at least partially disposed insaid hollow portion, means including relatively staggered longitudinallyextending recesses on said drive'and driven members and circumferentialrelatively aligned recesses on said drive and driven members, the crestsbetween recesses on one of said members being of smaller dimension thancorresponding recesses on the' other member, to provide clearancesbetween the exterior of said drive member and the interior of saiddriven member when in assembled relation, and a firm bond of cushion.-ing material within the clearances between the interior walls of thedriven member and that portion of the drive member which extendsthereinto.

7. A joint comprising a rotatable, metallic drive member, a rotatable,frangible driven member providing a socket for said drive member, saiddrive member having a portion disposed in said socket, means providingclearances between the exterior of said drive member and the interior ofsaid driven member when in assembled relation, thebottom of said socketbeing slotted to provide a key-way, and the end of said drive memberbeing formed with a tang of expanding while cooling from plasticcondition to congealed condition, the internal walls of said socketbeing equipped with flutes providing crests andvalleys to provide amechanical lock in addition to the bond to eliminate relative rotationbetween the drive and driven members, and the crests of the fluteshaving circumferential grooves effecting a mechanical lock with thelbondto eliminate axial movement between the members. I

11. A rotary joint comprising a rotatable inetallic drive member, arotatableglassdriven on the respective members being provided with.

adapted to mate with said key-way, and a firm bond of cushioningmaterial within the clearances between the interior walls of the drivenmember and that portion of the drive memberwhich projects thereinto.

8. A joint comprising a rotatable metallic drive member, a rotatablefrangible driven member comprising head and hub portions, a socket insaid hub portion for said drive member, said drive member having aportion disposed in-said socket, means providing clearances between theexterior of said drive member and the'interior of said driven memberwhen in assembled relation, the bottom of said socket being slotted toprovide a'key-way extending into the plane of said head portion, and theend of said drive member being formed with a tang adapted to .mate withsaid key-way, and a firm bond of cushioning material within theclearances between the interior walls of the driven member and allportions of that portion of the drive member which projects thereinto. i

9. A rotatable joint comprising mechanical 1y interengaging members, onearranged to be driven by theother, andone-of saidmembers being formed offrangible material, and a load distributing bond between said membersdisposed in and about the inte portions of said movement by the radialoverhang of the respective crests on the members, the crests of theflutes circumferential grooves aligning with one another to efiect amechanical lock against axial movement by the members, when filled with.a bonding medium, and a bonding medium consisting of plasticmaterialcongealed in the-space between the 'co-related'flutes andgrooves, on the members to provide a firm resilient bond between themembers in addition to the mechanical lock between the-crests andvalleys.

12. In a pump of the type adapted to handle corrosive fluids, andwherein elements of said pump are subjected to a wide-range of createdtemperatures, the combination of a joint comprising a-drive member, adriven frangible pumpa ing memb'er provided with a socket, a portion ofsaid drive member positioned in said socket, and a combined mechanicaland cushioning, load distributing bond between said members effective tocouple them-together, said load distributing bond including mechanicallyinter-related ele-:

ments on the drive member and in the socket, and a plastic materialdisposed in and about said elements.

13. A joint comprising a rotatable, metallic drive member, a rotatable,glass, driven member provided with a laterally projecting hub'to receivesaid drive member, means providing clearances between the exterior ofthe drive; member and the interior of the'hub when in a'ssembledrelation and acushioning bond of thermoplastic material in theclearances between the drive member and the interior of the hub, saidmaterial having the property of expanding while solidifying, whereby itis expanded into said clearances.

HAROLD E. ADAMS.

WILLARD A. KAZIES,

